According to the article, the union and UGL met on October 25 to discuss the grievance, but neither party could accurately determine how many people were employed by ABM before the switch.

Neither party could therefore agree on how many vacancies were then created by the switch, the article noted.

"UGL Unicco was required to first offer jobs back to all of the eligible janitors working under ABM before the switch and to then offer the remaining jobs to part-time janitors who want to assume full-time positions," said Matt Gulish, deputy director of higher education for SEIU.

Executive Vice President Patricia Campbell has assured all parties that the Tufts administration will continue to monitor the situation and will require UGL Unicco to uphold the requirement of offering jobs to all previously employed, eligible workers, the article added.